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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c019397b7e5fdbee0d11404ece7e3ef2cc688123d59ea52cf5163dc92c8c4db' 
  AND token = 'R32caB7czDr3ww5bmOJ4L65tX2MaEV96PB8H26XIZvU=' 
  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"
    }
  }
}