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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd44bde90332ad635283270b6b9b9b93a169284a73580462df43579babbcea97' 
  AND token = 'gCq2jNLb84VzgWXX960vU582YvMlnda0Y6n71QSXl58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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