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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3910a922f2df3184472aa57c973e530264803e724eb99b7e698811685f3166' 
  AND token = '6krz/CMW0N3mLiCnYq0FeyeK0YtPqdVfTBxWYbATz98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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