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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c596f296c873bf24128590119ae11fafe674f0c1a11f636105b80dac1f3bc0' 
  AND token = 'mGa7WRAE+V7GrvD+B9bsZk/evPZO1Um88T3Dr4VXcSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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