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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4965e1f1939be5eb1eb9660bb9a94c32b0008c0dafa08cc225e23084dbbcce24' 
  AND token = 'GhIYsBbAcF9pXG8IF3i5TXVRYXD/1vW4+NWrI9r6OyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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