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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d8437a1ad8166e7879a3a020c815a0f64a033a87a4f678f3309ae04b445d40' 
  AND token = 'iuWz+nLnknwjDpFeqOdjlh43G4uYCvBJ0/1k31BWT7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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