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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faac0738f09726ff33c9ae032abf72f2e6817b68b6545bc5138e4ac933ce3552' 
  AND token = '8kRhk/YOOJWYl+uITrlqfNY0Wfa01rjexN13P/mUFSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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