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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f8aa361f4190cb02771c6801ef1a22e306625fb2b3d4c40f7a2f60587360d5' 
  AND token = 'y/v13/oped2/trXkDuNNPg6rOsoXV2QJ4iesza1rDP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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