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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0284cc69da91590076acdaa744b89d96bed66d1f00c7860ce0849735f03e697' 
  AND token = '9BxdgvHo4kmnt4CNe1jjRCtPwEyZ258BoGfixIwmZRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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