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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25164a16c533216b86895c928bd149b11a8d8f2459b1bf0288b51d92d596bf83' 
  AND token = '4bvJwUyixCNwHMldp+PauAv2E1q33Xsb0Uu/t6H8/Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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