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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78254018de14df3654009aea6d2db871db656250285c9d2f5a5abb73392d5955' 
  AND token = 'q96HH6TMY6e7Pf9p1NtBa9ALzfLrbQfLBxtnROlbnHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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