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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5e5e67c5a6058ccd4c9af2c092fa46c72f1a07927a45cb737ee0f207e198c5' 
  AND token = '2n7cpbMpXFVH7DVeBJcaYmaoi+80S2mE5mLSQi01pbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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