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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c57b073938d876eaee336a73f32cbbd7bcafa5e8ebe7b3d703e0ae8e31ee5b' 
  AND token = '33tt/Jg6naT6yE4LFPdp7Q/sOiif7kkNJEJug19hG+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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