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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b5adc1e024b027f069c9c98b0dabbce61dda43f96157e5cc97ba8c78686fe2' 
  AND token = 'lJxqtXCJcLmm+r8td73twH14xZY3j9zbn5vp0jX4bwQ=' 
  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"
    }
  }
}