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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b1a603a7679437fb53090b0d797e334841d0b3d9e32ec19574fdaeb7600b71' 
  AND token = '2cYomZPdxy1+wmXwWhbe5LpJcio35ayQ1ou5fyL5zY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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