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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0809c1c113259369e182116f2f04ebd99528d07ba3475ff8cd088d96c5788729' 
  AND token = 'Ti99BCdaGclfvm8vGDfOre3D0DoJbC1v7pEMgxiNZ7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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