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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e418cf854f63c48f40e820566f4f935f836ee57ebd3551c1b4c8461a1e393a2' 
  AND token = '20jN0C7m6BKUPONF+9o3wwyRdQnLBvhuc3orEOn4EDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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