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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84d7812fe44410e7d4cc4b907c54d9fc5f951f873528186f5f5893fa8326fc2' 
  AND token = 'Ylsp845CJDq0DhG0ZxbSarsJM/rM1AC0xrdsk1iySo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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