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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3b3d3a2408f8b1bce1137af0b9f3ca37f6da9eefe21a939841c5a9e1764f98' 
  AND token = 'tLXzE/JEFxY1t3MbbRDDYO26vkTr3Am+gKPQ5o74KNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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