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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2f65f3d43678a6ebe024334be858fa70e0e8fd0d21bc80c2b4ef2a5b88ec17' 
  AND token = '0ZJ0UrqEjfydW6pEhe5Hl+0ZGuorm8XYDTL/kM88G7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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