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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834e98ecc203f838a0f77d8dc8e9afb8d7f514c71448127dae4bb8c4977edcd1' 
  AND token = 'kC9nVhvW115lROiV0IUKwIR5CWEI3FJd+K4BxpJgHB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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