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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb97a9c65219d2c1c9f3ecb6920826efb533c64f2001b9cceb8c6d5f4c3db29b' 
  AND token = 'IzKq02ZaT1JEJl5YPKY6GhfTdV31muxrDM2iLKskj/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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