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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64c8da66379202090e22c8aca523f30f4fbe6e9a952049fad1d874ca83edd7a' 
  AND token = '4BO8a+cKVmm4dZ7aUX5svjwVZkUddEK9bBjXgVfil60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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