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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b27a236b4c1bca3a4b38106c65b662bd8856c86aa562bf149cb36b8ccb09824' 
  AND token = 'Nd/6T9umcTgeO2DOF0vt2C+tQfafE4h4xfRibUZpnao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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