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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0139a161a618c3dc188321371f86c42ba1807c19349d17508972e05051dca0e7' 
  AND token = 'eqZvduqTbC+Rw508QGmJFZ7Pfltrplac565eKPzg3Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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