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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3fe3d5083443080b5d72e5572ba1a5836cf499fae5a5ace5e90759b8864369' 
  AND token = 'yeFEcRODLUE/coss1t6PJxuu5trT7O1oL3+lhxcz2IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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