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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec62168901b00fe9e68b353d3c14d4d08495e1070b547f57bb5d4ae153d30a2' 
  AND token = '8ImtD4V8t91T6QGDKUdNuzkNTaGMeV/yUI9j65mo0I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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