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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c937610240299e0d28e950c441382b9bba7f4cd46ff8fff8a680d92062c88693' 
  AND token = 'ictT/K1xtCbI3Aw+MJ5RI3z+xBPLk63mKbUru2Pj1NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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