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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26ba9be0e17dd0bfde1364960e52b8ea2a4ade6776a1e96796f729ec398ca47' 
  AND token = 'vx8cbMYeYIe882Z/mK/pliSxH6r9vqXXjfV+9Ye04Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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