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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed41782e7e419b3175063f4b37bb1b91393d9c95007a3184dd6ce600f13036a7' 
  AND token = 'cKdNsMSdydq+MoUXvvz2kOm8NSI+/qe3LMbaJHDdVm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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