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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c65e1e924566dfb6caf22f0ed5c92febfd9aafaa50b2e3b6285c149b242ddcd1' 
  AND token = 'MpkAqJ9HNg9lIvoVSZ2RQk2TB5iwjb5ZITx41Wls660=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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