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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902196fbb2df26e2f2168ee3e0841da3d2f769ef48d4f47ce32a20f980e65a3a' 
  AND token = 'M7a5F1Xzp/LXULXOPYt/Incr/2nzR70mqtJGyt9mWQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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