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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7549102525505a469ed6d1c03b5c35c58b635bde2ebb81385396be0bc546a8b9' 
  AND token = 'IFNLkKCC/EdZMhiGS7rlVueIqU+Pc2wq0VTbL/dP/ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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