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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14b77547d75043ef2def6c9430ee3f886c42a5f1336d880ceacc296d45b9637' 
  AND token = '7qydh0poSmwLR4OWdOVsEYo40PRbUAvbb92CChVEsqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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