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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4c973eee247c784d85624c09875e8a6cd47d626a2ab8d4ebe2852f0b07fca7' 
  AND token = 'nE/Q74Vv/fFerzy2pFY3WGIBsf2D7MriqBAhbcb5GSY=' 
  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"
    }
  }
}