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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ad09af8aae0828b97889c5348678521c1a224e1c05bcc0701ea2568c01ccbe' 
  AND token = 'Dt17dCdpo85ZbQbJ8Nq4b8V6n1SMtjfeWqfhnyFsNy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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