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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c420a5540e5ef6999434193443b1d86589cc4857697cfb848cdb285ed8388447' 
  AND token = 'B6r3EBt9ldPvbZyu+iHxqn2xxRo7cblg9UXuffeqLM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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