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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b840418af178579a5c660431c837087f755cd12998b2d89b4591e990b8378cce' 
  AND token = 'wQc0g+iELS39w48pw/Qz75xHG2eU4inXA22BpwaUiI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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