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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3dded89bb217362c0cb83d7a93646a0853feb18d71b3a3693a96a881dc2fa53' 
  AND token = 'OVmX3qVj97BV/CrJ1hRkyeP//t5yZJPmKLhc9eVll9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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