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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d2eef8f59a0d7aec646ab3012610fda7d26859f8e0a3efb4613ccb45f2c34b' 
  AND token = 'M8hQ85jF6MB+rvJvWluOdOR1rMjR0LFMxbWOKI5SujA=' 
  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"
    }
  }
}