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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3445b0bc742bffd431cd12c3785332cd5402a5d513fc95d7699e60f9df521316' 
  AND token = '1OYqL0MIhfkO0iKvAkBX6thBKcsZ81ylDaoTLqeX83g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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