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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fdccdc4ec4a522a85cab8b662846f34f837f8e8b2d1d2e1ab14011d1a0c3e2' 
  AND token = '8F58q7i5fRZuO4U5et9YXgWSQ9pLJcR7HRxLkV71YXo=' 
  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"
    }
  }
}