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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5f4d7cce2e3fa88e39405733b06183232c5ac3ad3c79b1a64e9ed5dbee923b' 
  AND token = 'W7XWd8OFj5IfJ5qReJ3Tw7ipF3zXOVzw1nyR2N5BwzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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