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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89535f18146a3476ee491095c975a18fba890f2c9815cf1b0eeda1377f43c5bb' 
  AND token = 'o7kcgDSz/S2HBbMP+vgaOrOKH559uRqgpxVTkX0smrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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