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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243d704f8c134ad2c09634cd7178133e45f2a0fcc75664c6c1f938d9079a492b' 
  AND token = 'Q/+33DFp94+89w4Auhy93XUMjI8tH2Zbd3FqtRehcVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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