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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5989d53f31dbd3bd0e3f6e579b094a7a80d989c5b87d0051988b4171e0435f1' 
  AND token = 'xr1qG++falGjWtbkK9ecToS74ocECUmsA70BbxepwkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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