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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1975dd197c3581dc5902eb01d418cdcd6ac480a5ef7ca2ef4cae2af42262c64' 
  AND token = '39nvYFljcMPyIRF3nhfnLsaaPVu/sBCPldRLH+droJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}