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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5cbfaa0a8d595470e3fb32ee814158630f25ed8d5b942748e13fc3d60dacde' 
  AND token = 'nNYR0xVIfxylOh0y0lU52KFjb3iRdHdjgBDtiFR1RG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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