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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a342d07d91a3aca146c1b814041abfe3815b09d547ab5dcaa3d87762d92a2b4' 
  AND token = 'MVETn2w8Iaz/1GPVhExmxk+WtsQKL9U5IwVOnPY2Y2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00137

JSON explain

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