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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aedd77eb347c696b200c587a538989894bc0be6037108b3c51a65ed719129df4' 
  AND token = 'Mdhx1LQPqYTuwgM3emaAVb+3WEiQQjue9IE2/x9k58Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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