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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c1e397f30deccd546e987731d2a6ff26e29af0d274bbac08f13b3670ddebf5' 
  AND token = 'KKCRk+rEJXt/8sc08LOfJ6ak8a+sezsEwGdQ+N7beog=' 
  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"
    }
  }
}