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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf7f2c32cc2908a1fa7d7b13864966788848faf829e6e70d63ffb54d9bc92db' 
  AND token = 'I69PffiWBwSGN+LB+yYn91Wm7RUBTVG2dCPWke24mug=' 
  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"
    }
  }
}