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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead1f9ab83b3f00ad8f4399f4a41e621c0d0e3f29a5f6a222968336e8cf2ebff' 
  AND token = 'XouNq8lUPOJFsoSVeWu/uenXP7JZWn4Wf+8Hj0gJAQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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