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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3982909524dbd1f967a27aa28e2f7385e78647734b8480baf5a7c73dfaadadc3' 
  AND token = '9+8+kWr3qh46+mCjCS0eOHmD+U3+3adOlA9FIFHNOPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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